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LOANS AND LEASES, NET - Troubled Debt Restructured Loans (Details) - National Lending - Commercial finance - USD ($)
9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]    
TDRs subsequent default, recorded investment $ 7,200,000 $ 1,500,000
60-89 Days Past Due    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
TDRs subsequent default, recorded investment $ 0